How is Tungsten Carbide Powder Produced?

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WC powder is produced through the direct carburization of tungsten powder. Various processes are used to produce ultra-fine WC powders. The particle size of the WC particles determines the size of the WC powder.

Traditionally, the hydrogen reduction method is used to synthesize WC. This process involves pressing or sphericalizing a mixture of WO3 and graphite, and then heating it to a high temperature. In addition to the resulting tungsten carbide, other intermediate products are formed.

Recently, nano-scale WC powders have been produced by thermal plasma reaction system. They are less than 20 nm in diameter. These WC powders can contain small amounts of W2C phase.

A solvothermal method is also used to synthesize WC powder. The original mixture is heated to a specific temperature in a sealed container with an organic or non-aqueous solvent.

Another approach is the use of a carbon black as a reductant. During the C diffusion reaction, a thin layer of WC grows around the W particles. It is this thin layer that enables the growth of polycrystalline WC.

Carbonized WC powder is analyzed by Venables and Brown. Increasing the insulation time increases the oxygen content of the WC powder. But it is crucial to control the insulation time. Higher temperatures have a significant effect on the particle size of WC.

Spherical tungsten carbide powder is mainly made from a mixture of tungsten and tungsten carbide. It is characterized by good hardness and wear resistance.

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